Preventing mass killings like the one in Newtown may be impossible. But there’s plenty we can do to reduce violence by the mentally ill in general. And the tools are right there in Obamacare.By Harold Pollack

Conservatives love to apply “cost-benefit analysis” to government programs—except in health care. In fact, working with drug companies and warning of “death panels,” they slipped language into Obamacare banning cost-effectiveness research. Here’s how that happened, and why it can’t stand.By Phillip Longman